Malicious PDF — malware analysis report

Static analysis result for SHA-256 253fabc89a3ae0e5…

MALICIOUS

PDF

78.2 KB Created: 2021-04-05 04:28:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: fb5c126a8e93c81049e4bf5bd986ce39 SHA-1: 99933c27943bcfcaf37afe6637ff1b2f892bcb77 SHA-256: 253fabc89a3ae0e568b6caac37d4f7c57d9c1e9570d58b48ee63d06ba9905126
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, identified as a link farm, likely intended to manipulate search engine results or redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, with the PDF_SEO_LINK_FARM heuristic confirming the presence of a link farm. While no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to drive traffic to potentially malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ponafet.ru/award?keyword=metodos+anticonceptivos+inyectables+pdf PDF link annotation
    • https://notolunezoxab.weebly.com/uploads/1/3/4/8/134846452/4760ea2bc4.pdfIn PDF document text
    • https://jevogivufete.weebly.com/uploads/1/3/0/7/130738845/84c50635e29f50.pdfIn PDF document text
    • https://letotanuvimipe.weebly.com/uploads/1/3/4/5/134598603/runagozuriwawi.pdfIn PDF document text
    • https://zogugixuwomu.weebly.com/uploads/1/3/4/2/134234599/kegutawekopoz.pdfIn PDF document text
    • https://burusezal.weebly.com/uploads/1/3/5/3/135306482/6d1f796584.pdfIn PDF document text
    • https://desudesukijowa.weebly.com/uploads/1/3/6/0/136033838/5296925.pdfIn PDF document text
    • https://zamamuxito.weebly.com/uploads/1/3/4/2/134234866/jamokasebamurav-semopewivirin-pufuwunivab-zurowixir.pdfIn PDF document text
    • https://ravikuzisuwu.weebly.com/uploads/1/3/4/4/134470025/jekililekosatu-kerunuk.pdfIn PDF document text
    • https://sukodijam.weebly.com/uploads/1/3/4/5/134516983/dupovukatak.pdfIn PDF document text
    • http://gitipakivo.iblogger.org/greek_mythology_symbols.pdfIn PDF document text
    • https://wabiwuwisurukim.weebly.com/uploads/1/3/2/6/132682822/nesikovodag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/sefepugolupalax/commanding_my_morning_prayer_cindy_trimm.pdfIn PDF document text
    • http://bovofekigigewij.rf.gd/xupiluxofu.pdfIn PDF document text
    • http://kavafaj.rf.gd/67738469221.pdfIn PDF document text
    • http://migozojejaga.rf.gd/66280630931.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/audition_2_game.pdfIn PDF document text
    • http://mumuvovowoxoje.epizy.com/22349224958.pdfIn PDF document text
    • http://xezepagonozaniw.epizy.com/rockefeller_habits_book.pdfIn PDF document text
    • http://zukugomofam.epizy.com/76085727391.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/ravoros.pdfIn PDF document text
    • http://jopewadakos.epizy.com/thermochemistry_hess_s_law_lab_report_discussion.pdfIn PDF document text
    • http://roxuriwiladubew.rf.gd/principle_centered_leadership_free_download.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E0 5148 bytes
SHA-256: d620bd169e51710c3331483e06c46a6b25c5d57f69a004de4eebd12a4d8b6cc9
font_01_sfnt_off0000f587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF587 11608 bytes
SHA-256: 0d28f834f2a7e78bb3313846862fdd1ae82ea2a0bfeabb95a6f52b967290a7f4
font_02_sfnt_off00011b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B68 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333